Table 1: Plant ion transporters involved in salt tolerance identified by functional analysis.

NameSource speciesGene productFunctionIdentification methodHarbourg speciesReference

                              Sodium influx

AtHKT1A. thalianaNa+ transporterNa+/K+ homeostasisMutationArabidopsis[13]
HKT1T. aestivumNa+/K+ transporterK+/Na+ homeostasisOverexpressionWheat[31]

                              Sodium efflux

AtSOS1A. thalianaPlasma membrane Na+/H+ antiporterNa+ detoxificationMutationArabidopsis overexpression[76]
TaSOS1T. aestivumPlasma membrane Na+/H+ antiporterNa+ detoxificationMutationArabidopsis overexpression[99]

                            Sodium compartmentation

AtNHX1A. thalianaVacuolar Na+/H+ antiporterNa+ vacuolar sequestrationOverexpressionArabidopsis,[11]
Cabbage, tomato[93]
TNHX1T. aestivumVacuolar Na+/H+ antiporterNa+ vacuolar sequestrationOverexpressionArabidopsis[96, 114]
AVP1A. thalianaVacuolar H+-PPaseH+ transport, vacuolar acidificationOverexpressionArabidopsis[15]
TVP1T. aestivumVacuolar H+-PPaseH+ transport, vacuolar acidificationOverexpressionArabidopsis[96, 114]

                            Regulatory genes

SOS2A. thalianaSerine/threonine Protein kinaseSOS1 regulatorMutationArabidopsis[87]
SOS3A. thalianaCa++ binding proteinCa++ sensor/SOS2 activatorMutationArabidopsis[81]